Electronic Supplement to
The AHEAD Portal: A Gateway to European Historical Earthquake
Data

Macroseismic Intensity symbols color codes

The standard AHEAD symbol set used to represent macroseismic intensity values on the maps, is based on circles of the same size, warmer colors for higher intensities and colder colors for lower intensities; uncertain intensities have the two colors corresponding to the higher and lower intensity.

Uncertain intensities are represented with two concentric circles; the internal circle has the color of the lower value, and the external circle has the color of the higher value. The unconventional, although widely used value "F", felt, is represented using an empty circle.

The symbol set developed by AHEAD has been included in the "New Manual of Seismological Observatory Practice (NMSOP-2)" (Chapter 12, Musson and Cecić, 2012).